package com.atguigu.netty.dubboRpc.netty;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

import java.lang.reflect.Proxy;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class NettyClient {
    //创建线程池
    private static ExecutorService executor=Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    private static NettyClientHandler client;

    //编写方法，使用代理模式获取一个代理对象
    public Object getBean(final Class<?> serviceClass,final String providerName){
//        ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
//        ClassLoader classLoader = serviceClass.getClassLoader();
//        System.out.println(contextClassLoader.hashCode()==classLoader.hashCode());
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),new Class<?>[]{serviceClass},(proxy,method,args)->{
          //{}部分的代码，客户端每调用一次hello,就会进入该代码
          if(client==null){
              initClient();
          }

          //设置要发给服务器端的信息
            //providerName 协议头  args[0] 就是客户端调用api hello(???)中的参数
          client.setPara(providerName+args[0]);
          return executor.submit(client).get();
        });
    }

    //初始化客户端
    private static void initClient(){
        client=new NettyClientHandler();
        //创建EventLoopGroup
        NioEventLoopGroup group = new NioEventLoopGroup();
        Bootstrap bootstrap=new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY,true)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel socketChannel) throws Exception {
                        ChannelPipeline pipeline = socketChannel.pipeline();
                        pipeline.addLast(new StringDecoder());
                        pipeline.addLast(new StringEncoder());
                        pipeline.addLast(client);
                    }
                });
        try {
            bootstrap.connect("127.0.0.1",7000).sync();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }
}
